Assuming you've seen Alien, which is easily the best, then I'd suggest the excellent Planet of the Vampires and Queen of Blood. If you're on the look-out for dumb fun, then go for Pandorum and Hellraiser: Bloodline.

Mr. Light wrote:

For some reason "Jason X" springs to mind...

It has some great moments but is largely bland and boring. New Line Cinema have never understood how to treat the franchise. I can watch the first 8 films over and over.